Installing Debian via the Internet

This method of installing Debian requires a functioning Internet connection
during installation. Compared to other methods you end up downloading
less data as the process will be tailored to your requirements. Ethernet and
wireless connections are supported. Internal ISDN cards are unfortunately
not supported.

You set up a TFTP and a DHCP (or BOOTP, or RARP) server which will
serve the installation media to machines on your local network.
If your client machine's BIOS supports it, you can then boot the Debian
installation system from the network (using PXE and TFTP), and proceed
with installing the rest of Debian from the network.

Not all machines support booting from the network. Because of the
additional work required, this method for installing Debian is not
recommended for novice users.